AIRBORNE PARTICLE MOVEMENT IN A GENERIC INDOOR SPACE
W/ A MIXED VENTILATION SYSTEM
The video clip below shows the results of computer modeling of a classroom type space to demonstrate movement of micron-sized particles carried on room air currents. These particles could be biologically or chemically harmful and represent a health hazard via direct contact and inhalation. This model demonstrate that the conventional top-down mixing ventilation (MV) system common in the US promotes the dispersion of particles in indoor spaces. New ventilation methods are needed to purge indoor spaces of these harmful particles.
[See the simulation below to get a look at a type of directional ventilation [CoVentilation TM] that makes indoor spaces safer by reducing mixing in the space.]
DIRECTIONAL VENTILATION SIMULATION
This is a simple computer model of a space similar to a Doctor's exam room showing a type of directional ventilation (DV) [CoVentilation TM]. Air enters the room mid-wall at an air change rate (ACH) of about 2.5 room volumes per hour and returns from a centrally located exhaust grill in the ceiling. Supply duct positions set up a mild swirl pattern in room that has a gentle upward movement. Blue dots simulate 3-micron particles with specific gravity of 1.4, similar to the nuclei of a desiccated aerosol particle exhaled by one of the room occupants. Second half of video shows residence time of particles after injections stop. [Total simulation time ~10-minutes. No audio.]